Environmental and neuroendocrine regulation of annual gonadal cycles and migratory behavior in birds.
D000818:Animals; D001683:Biological Clocks; D001717:Birds / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology; D006066:Gonads / Q000502:physiology*; D007030:Hypothalamo-Hypophyseal System / Q000502:physiology*